Question: 6% of all semiconductor chips produced in a Taiwanese factory are found to be defective. A sample of 25 chips is randomly selected for testing.

[a] Find the mean and standard deviation for the number of defective chips.

[b] Find the probability that there are exactly 2 defective chips.

[c] Find the probability that the number of defective chips more than 3.

[d] Find the probability that the number of defective chips is between 1 and 5 inclusive.

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